def test__last_month(test_input, expected):
# Act
with freeze_time(test_input):
first, last = cli._last_month()
# Assert
assert expected == (first, last)
def test__last_month(test_input: str, expected: str) -> None:
# Act
with freeze_time(test_input):
first, last = cli._last_month()
# Assert
assert expected == (first, last)
def test__last_month(self):
# Arrange
# Act
first, last = cli._last_month()
# Assert
self.assertEqual(first, "2018-08-01")
self.assertEqual(last, "2018-08-31")